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大粒径富水卵石地层盾构下穿既有线技术措施.docx

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大粒径富水卵石地层盾构下穿既有线技术措施 Title:MeasuresforTBMTunnelingthroughCoarse-GrainedandWater-RichBoulderStrataUnderExistingLines Abstract: TunnelBoringMachine(TBM)technologyhasrevolutionizedthefieldofundergroundtunnelingduetoitsefficiencyandsafetyadvantages.However,challengesarisewhentunnellingthroughcoarse-grainedandwater-richboulderstrata,particularlywhentheexistingtransportlinesneedtobepassedthrough.ThispaperexploresthevariousmeasuresandstrategiesemployedtoovercomethesechallengesandensuresuccessfulTBMtunnelingundertheseconditions.Themeasuresdiscussedencompassacomprehensiverangeofpre-construction,construction,andpost-constructionsteps. 1.Introduction: Thesignificanceandchallengesrelatedtotunnelingthroughcoarse-grainedandwater-richboulderstrataunderexistinglinesareintroduced.Theimportanceofadoptingappropriatetechniquesandmeasuresisestablishedtoensurethecompletionoftunnelingprojectssafelyandefficiently. 2.SiteInvestigationandGeologicalSurvey: Adetailedsiteinvestigationandgeologicalsurveyarecrucialinunderstandingthestrata'scharacteristicsandidentifyingpotentialchallenges.Techniquessuchasdrilling,sampling,andtestingareemployedtoassessrockstrength,watercontent,androckmassstability. 3.GroundImprovementTechniques: Tostrengthentheweakboulderstrata,groundimprovementtechniquessuchasgrouting,soilnailing,jetgrouting,andpre-excavationgroutingareutilized.Thesetechniqueshelpstabilizethestrata,reducewaterinflow,andminimizetheriskofgroundsettlement. 4.TBMSelectionandModification: Basedonthestrataconditions,thesuitabletypeandsizeoftheTBMareselected.Modificationsmayberequiredtoenhancethemachine'sabilitytohandlecoarse-grainedandwater-richstrata,suchasincreasingthecutterhead'storquecapacityoraddingadditionalwatertreatmentsystems. 5.ShieldDesign: Theshielddesignmustconsiderthespecificchallengesposedbycoarse-grainedandwater-richboulderstrata.Reinforcedcutters,improvedsealingsystems,andoptimizedsoilconditioningagentsareincorporatedintotheshielddesigntoensuresmoothandcontinuoustunnelingoperations. 6.W